Waterproof breathable composite materials for fabrication of flexible membranes and other articles

ABSTRACT

A waterproof breathable material has a higher strength-to-weight ratio and higher tear resistance-to-weight ratio than traditional materials, and may be applied in a wide field of potential uses. A non-woven composite material comprises at least one waterproof breathable (W/B) membrane, a first unidirectional non-woven composite layer having multiple fibers enclosed by adhesive in parallel to each other, a second unidirectional non-woven composite layer having multiple fibers enclosed in adhesive in parallel to each other. The first unidirectional non-woven composite layer is positioned such that the fibers are oriented 90° relative to the fibers of the second unidirectional non-woven composite layer, and a space is formed between the first and second multiple fibers. No adhesive is present in the space.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Continuation Application of U.S. patentapplication Ser. No. 13/168,912 filed Jun. 24, 2011, which claimspriority to U.S. Provisional Application No. 61/358,394, filed Jun. 24,2010, and U.S. Provisional Application No. 61/370,448, filed Aug. 3,2010, which are incorporated herein by reference in their entireties.

FIELD OF THE INVENTION

The application relates to Waterproof Breathable materials, particularlyto an improved Waterproof Breathable material for a variety of uses andapplications.

BACKGROUND OF THE INVENTION

In the prior art, a lamination process is used to bond WaterproofBreathable (“W/B”) films or membranes (typically manufactured from PTFEor PU) to woven fabrics. The purpose of the woven materials, typicallynylon or polyester, is to provide material properties, such as strength,stretch resistance and tear resistance to the laminate. The problem withthe resulting W/B woven materials and randomly oriented non-woven W/Bmaterials is that their heavy weight, low strength-to-weight ratio,excessive thickness and low tear resistance and rip stop propertieslimits the material's usefulness. Thus, a need exists for a materialhaving a higher strength-to-weight ratio and higher tearresistance-to-weight ratio that may be applied in a wide field ofpotential uses.

SUMMARY OF THE INVENTION

A waterproof breathable material has a higher strength-to-weight ratioand higher tear resistance-to-weight ratio than traditional materials,and may be applied in a wide field of potential uses. A non-wovencomposite material comprises at least one waterproof breathable (W/B)membrane, a first unidirectional non-woven composite layer havingmultiple fibers enclosed by adhesive in parallel to each other, a secondunidirectional non-woven composite layer having multiple fibers enclosedin adhesive in parallel to each other. The first unidirectionalnon-woven composite layer is positioned such that the fibers areoriented 90° relative to the fibers of the second unidirectionalnon-woven composite layer, and a space is formed between the first andsecond multiple fibers. No adhesive is present in the space.

BRIEF DESCRIPTION OF THE DRAWINGS

A more complete understanding of the present invention may be derived byreferring to the detailed description and claims when considered inconnection with the Figures, where like reference numbers refer tosimilar elements throughout the Figures, and:

FIG. 1 illustrates an exemplary embodiment of a woven material havingone-directional reinforced construction; and

FIG. 2 illustrates an exemplary embodiment of a woven material havingtwo-directional reinforced construction;

FIG. 3 illustrates an exemplary embodiment of a woven material havingfour-directional reinforced construction;

FIG. 4 illustrates an exploded view of an exemplary embodiment of awoven material having four-directional reinforced construction and abias ply reinforcement layer and a fabric top layer;

FIG. 5 illustrates an exemplary embodiment of a woven material havingone-directional reinforced construction with a non-W/B polymer coatingthe fibers and embedded in a W/B polymer;

FIG. 6 illustrates an exemplary embodiment of a woven material havingone-directional reinforced construction with a non-W/B polymer coatingthe fibers and embedded in a W/B polymer; and bonded to a W/B membrane;

FIG. 7 illustrates an exemplary embodiment of a woven material havingone-directional reinforced construction with the fibers embedded in aW/B polymer;

FIG. 8 illustrates an exemplary embodiment of a woven material havingone-directional reinforced construction with the fibers embedded in aW/B polymer and bonded to a W/B membrane;

FIG. 9 illustrates an exemplary embodiment of a woven material havingfour-directional reinforced construction with the fibers embedded in aW/B polymer; and

FIG. 10 illustrates an exemplary embodiment of a woven material havingfour-directional reinforced construction with the fibers embedded in aW/B polymer and bonded to a W/B membrane.

DETAILED DESCRIPTION OF THE INVENTION

While exemplary embodiments are described herein in sufficient detail toenable those skilled in the art to practice the invention, it should beunderstood that other embodiments may be realized and that logicalmaterial, assembly, and mechanical changes may be made without departingfrom the spirit and scope of the invention. Thus, the following detaileddescription is presented for purposes of illustration only.

Waterproof Breathable composite materials provide the next generation inlightweight, high strength, flexible, Waterproof Breathable (“W/B”)materials. In an exemplary embodiment, a W/B membrane (such as PTFE orurethane W/B material) is bonded to a Composite Material. As usedherein, Composite Material is defined as one or more layers ofunidirectional fiber and polymer matrix plies oriented in one or moredirections. These membranes may be either waterproof but porous to gasand water vapor flow or they may be non porous but allow water vapor tomove through the material via diffusion. In an exemplary embodiment, theComposite Materials are made from thinly spread high strength fiberssuch as Dyneema®, Vectran®, Aramid, polyester, other materials that arecoated with adhesive or other material, or any combination thereof. Theadhesive or other polymer used may be a W/B type of urethane polymer,though other non-urethane W/B materials or non-urethane non-W/Bmaterials may also be suitable. The advantage of the exemplary CompositeMaterials is that the manufactured materials can be significantlythinner, more flexible, have better touch and feel characteristics, andare lighter than woven and randomly oriented nonwoven materials withoutsacrificing strength or other material properties. In an exemplaryembodiment, a W/B Composite Material has a higher strength-to-weightratio and tear resistance than other flexible W/B materials currentlyavailable on the market. Additionally, the exemplary Composite Materialhave limited impact on the breathability of the membrane because theareas between the fiber filaments, monofilaments, threads or tows areeither free from gas permeability blocking polymer or contain apermeable W/B adhesive or film which allows gas breathability whilepreventing or inhibiting the flow of fluids. Tows are a fiber bundlewith a plurality of monofilaments. The W/B membrane may or may notincorporate unidirectional reinforcing filaments, fibers, or tows.

In an exemplary embodiment and with reference to FIG. 1, a non-wovenlayered composite 100 comprises at least one layer that is a W/Bmembrane 101 and at least one other layer that is a unidirectionalnon-woven composite 102. In one embodiment, non-woven composite 102comprises multiple fibers 111 in parallel with each other. The fibers111 are enclosed by adhesive 112 that forms a cover. Furthermore, fibers111 of non-woven composite 102 are arranged such that spaces form thatare adhesive-free zones 120. However, other suitable configurations ofthe non-woven layered composite material are also contemplated.

In another exemplary embodiment and with reference to FIG. 2, anon-woven W/B composite material 200 comprises at least one W/B membranelayer 201, a first unidirectional non-woven composite 202, and a secondunidirectional non-woven composite 203. Similar to non-woven composite102, non-woven composites 202, 203 individually comprise multiple fibers211 in parallel with each other. The fibers 211 are enclosed by adhesive212 that forms a cover. Moreover, non-woven composite 202 and non-wovencomposite 203 are oriented such that the respective fibers 211 arerotated 90° relative to the adjacent layer of fibers 211. Thiscross-hatch configuration of non-woven W/B composite material 200 formsspaces 220 through the layers that are adhesive-free zones.

In yet another exemplary embodiment and with reference to FIG. 3, anon-woven W/B composite material 30 comprises at least one W/B membranelayer 31, a first unidirectional non-woven composite 302, a secondunidirectional non-woven composite 303, and a third unidirectionalnon-woven composite 304. Similar to non-woven composites 102, 202, and203, non-woven composites 302, 303, 304 individually comprise multiplefibers 311 in parallel with each other. The fibers 311 are enclosed byadhesive 312 that forms a cover. Moreover, non-woven composite layers302, 303, 304 are oriented such that the respective fibers 311 arerotated 45° or 90° relative to the adjacent layer of fibers 311. Thisadditional cross-hatch configuration of non-woven W/B composite material300 forms spaces 320 through the layers that are adhesive-free zones. Asis illustrated in FIG. 3, the adhesive-free zone spaces 320 in non-wovenW/B composite material 300 are more restricted than in non-woven W/Bcomposite material 200 due to the additional layer of overlap andadditional off-set angle of the fibers 311.

Furthermore, in an exemplary embodiment, the material layers arecombined and cured together using pressure and temperature either bypassing the stacked layers through a heated set of nips rolls, a heatedpress, a heated vacuum press, a heated belt press or by placing thestack of layers into a vacuum lamination tool and exposing the stack toheat. Moreover, external pressure, such as provided by an autoclave, mayalso be used to increase the pressure exerted on the layers. The vacuumlamination tool may be covered with a vacuum bag sealed to thelamination tool with a vacuum applied to provide pressure. Otherlamination methods may also be suitable as would be known to one skilledin the art.

The W/B composite material functions as a high strength-to-weight ratiobarrier layer that permits the transfer of gas, including water vapor,through the materials but not the transfer of liquid water. Furthermore,in various embodiments, the exemplary W/B composite material may be usedin but not limited to: sleeping bag shells, tent walls, and clothing. Inone embodiment, a Composite Material, such as a unidirectional fiberreinforced tape, is bonded to a W/B membrane. A preferred embodiment ofthe exemplary material would be material consisting of an eVent W/Bmembrane bonded on one surface to Cubic Tech product CT1, thus creatinga Cubic Tech product CTB1B3/NF. Various embodiments may include otherconfigurations of W/B membranes, woven and non-woven fabrics and othermaterials produced by Cubic Tech.

In a first exemplary embodiment, one or more layers of a W/B membraneare bonded to both outer surfaces of a Cubic Tech laminate. The laminatemay be of various different product weights, strengths, colors, andpatterns. In a second exemplary embodiment, the Composite Materialincludes coloration of the matrix or membranes through use of pigmentsor dye sublimation. In a third exemplary embodiment, a fire retardantadhesive or polymer is used, or fire retardants can be added to aflammable matrix or membrane to improve the flame resistance. Examplesof fire retardant additives include: DOW D.E.R. 593 Brominated Resin,Dow Corning 3 Fire Retardant Resin, and polyurethane resin with AntimonyTrioxide (such as EMC-85/10A from PDM Neptec ltd.), although other fireretardant additives may also be suitable. Fire retardant additives thatmay be used to improve flame resistance include Fyrol FR-2, Fyrol HF-4,Fyrol PNX, Fyrol 6, and SaFRon 7700, although other additives may alsobe suitable. Fire retardancy and self extinguishing features can also beadded to the fibers either by using fire retardant fibers such as Nomexor Kevlar, ceramic or metallic wire filaments, direct addition of fireretardant compounds to the fiber formulation during the fibermanufacturing process, or by coating the fibers with a sizing, polymeror adhesive incorporating fire retardant compounds listed above orothers as appropriate. Any woven or scrim materials used in the laminatemay be either be pretreated for fire retardancy by the supplier orcoated and infused with fire retardant compounds during themanufacturing process.

In a fourth exemplary embodiment, the material further comprises hybridlayup plys or hybrid stacks to modify or improve various mechanicalproperties of the material. Hybrid plys are defined as the usage of atleast 2 (two) non-matrix elements (various fiber types, wire, meshes,etc) within a single ply that make up the composite. A hybrid stack isdefined as the usage of unique separate plys, each containing at least 1(one) non-matrix element that is different than at least one adjacentply. The non-matrix element, for example, may be various fiber types,fiber coated or plated with metals or oxides, wire monofilaments, wiremeshes, and the like. In a fifth exemplary embodiment, a composite W/Bmaterial comprises a woven or non-woven cloth or leather on one or bothsides. In a sixth exemplary embodiment, the W/B composite comprises acompatible adhesive on one or both sides for lamination to third partyfabrics (woven, nonwoven, leathers) to upgrade the strength, tearresistance (rip stop) and add W/B properties to the third party fabrics.In a seventh embodiment, the W/B composite further addsanti-microbial/anti-pathogen resistance by the incorporation of one ormore if anti-microbial agents added or coated onto the polymer resins,film or fabrics, and anti-microbial treatments to the fibers,monofilaments, threads or tows used for composite material. Typicalmaterials include OxiTitan Antimicrobial, and nana silver compounds,Sodium pyrithione, Zinc pyrithione 2-Fluoroethanol,1-Bromo-2-fluoroethane, Benzimidazole, Fleroxacin, 1,4-Butanedisulfonicacid disodium salt, 2-(2-pyridyl)isothiourea N-oxide hydrochloride,Quarternary ammonium salt, 2-Pyridinethiol 1-oxide, Compound zincpyrithione, Compound copper pyrithione, magnesium pyrithione,BISPYRITHIONE, pyrithione, α-Bromo Cinnam-Gel, KFO ABC Silica Gelmanufactured. Fiber forms such as threads, tows and monofilaments can betreated with silver nano particles, or can have silver coatings appliedvia chemical or electrical plating, vacuum deposition or coating with asilver compound containing polymer, adhesive or sizing. Theanti-microbial/anti-pathogen materials may also be suitable.

Traditional W/B materials are constructed or laminated to woven basefabrics. In contrast, in an exemplary embodiment and with reference toFIG. 4, a W/B Composite Material 400 may comprise at least one layer offibers 402, 403, 404, 405 bonded to at least one of a first membranelayer 401 and a second membrane layer 406. Fibers 402, 403, 404, 405 maybe either a membrane or a fabric layer. Layers 401, 406 may be eithermembranes, fabric layers, or ply reinforcement layers. In someembodiments, only a single membrane or fabric layer is included. Inanother exemplary embodiment, a W/B composite material comprises onlyreinforced fiber plies, and excludes one or both membrane or fabriclayers. In an exemplary embodiment, at least one layer of fibers is aflexible non-woven composite made from unidirectional fiber/matrix tape.Furthermore, at least one type of fiber may comprise a single fiberlayer or multiple fiber layers. In addition, the fiber layers can be atany orientation relative to other fiber layers. For example, FIG. 2illustrates two layers of fibers with orientations of 0° and 90°relative to an axis in a membrane layer. FIGS. 3 and 4 illustrateexemplary embodiments of four layers of fibers with orientations of 0°,90°, −45°, and +45° relative to an axis in a membrane layer. The spreadfibers are arranged such that the fiber's filaments form “windows”facilitating breathability and gas permeability. In other words, thefilaments have a controlled spacing that results in gaps between thefilaments of each fiber layer and the gaps of each fiber layer alignwith fiber filament gaps of the adjacent fiber layer to form apass-through hole (window). In one embodiment, the filament spacing ineach fiber layer may be in the range of about one micrometer to aboutone centimeter. In accordance with an exemplary embodiment, the size ofthe gas permeable filament window is at least as large as the pores inthe W/B membrane. The filament windows and the pores in the W/B membraneallow gas or water vapor to transfer through the material. In otherwords, an exemplary Composite Material creates grids of “windows”between the filaments, which in turn creates a semi-porous material.

A W/B Composite Material comprising a unidirectional fiber/matrix tapemay utilize a resin or other adhesive to bond the materials together. Inaccordance with an exemplary embodiment, the flexible non-wovencomposite includes controlled adhesive content for optimized adhesivecontrol. In an exemplary embodiment using either a non-W/B adhesive or aW/B adhesive, the adhesive content of the flexible non-woven compositeis of sufficient amount to adhere to other layers but not a sufficientamount to form a continuous layer. Described another way, the amount ofresin adhesive on the flexible non-woven composite does not cover the“windows” in the fiber layers but instead leaves the desired gap. Theamount of controlled adhesive applied in each material is dependent onthe characteristics of the material layers. Some materials need moreadhesive to create a bond in comparison to other materials.

In another exemplary embodiment, a W/B adhesive is used to bond thematerials and the W/B adhesive may cover the “windows” while maintainingthe breathable functionality of the material. For example, FIG. 5references an embodiment of a non-W/B polymer 501 coating the filaments502 and a W/B polymer 503 filling the empty spaces or windows.Furthermore, in one embodiment and with reference to FIG. 6, a non-W/Bpolymer 601 coats the filaments 602, a W/B polymer 603 fills the emptyspaces or windows, and a W/B membrane 604 is bonded to W/B polymer 603.FIG. 7 illustrates an embodiment having filaments 702 embedded in a W/Bpolymer 703. Additionally, FIG. 8 references an embodiment havingfilaments 802 embedded in a W/B polymer 803 and also bonded to a W/Bmembrane 804. The embodiments referenced in FIGS. 5, 6, 7, and 8 mayinclude other layers of coated fibers, W/B membranes, woven fabrics orother suitable materials. FIGS. 9 and 10 are examples of suchembodiments that include multiple layers.

In an exemplary embodiment and with reference to FIG. 9, amultidirectional reinforced W/B material 900 comprises fibers 902embedded in a W/B polymer 903. Multiple layers of fibers 902 and W/Bpolymer 903 are stacked at designed orientations of 0°, 90°, +45°, and−45° relative to an axis in a membrane layer. Moreover, FIG. 10references an embodiment of a multidirectional reinforced W/B material1000 comprising fibers 1002 embedded in a W/B polymer 1003 and alsobonded to a W/B membrane 1004. Similar to multidirectional reinforcedW/B material 900, multidirectional reinforced W/B material 1000comprises multiple layers of fibers 902 and W/B polymer 903 stacked atdesigned orientations of 0°, 90°, +45°, and −45° relative to an axis ina membrane layer. One example of a suitable W/B adhesive isthermoplastic polyurethane (TPU) but other materials are also suitable.

Additional details with regards to material, process, methods andmanufacturing, refer to U.S. Pat. No. 5,470,632, entitled “COMPOSITEMATERIAL FOR FABRICATION OF SAILS AND OTHER ARTICLES,” which was issuedon Nov. 28, 1995, and U.S. Pat. No. 5,333,568, entitled “MATERIAL FORTHE FABRICATION OF SAILS,” which was issued on Aug. 2, 1994; thecontents of which are hereby incorporated by reference for any purposein their entirety.

Benefits, other advantages, and solutions to problems have beendescribed above with regard to specific embodiments. However, thebenefits, advantages, solutions to problems, and any element(s) that maycause any benefit, advantage, or solution to occur or become morepronounced are not to be construed as critical, required, or essentialfeatures or elements of any or all the claims. As used herein, the terms“includes,” “including,” “comprises,” “comprising,” or any othervariation thereof, are intended to cover a non-exclusive inclusion, suchthat a process, method, article, or apparatus that comprises a list ofelements does not include only those elements but may include otherelements not expressly listed or inherent to such process, method,article, or apparatus. Further, no element described herein is requiredfor the practice of the invention unless expressly described as“essential” or “critical.”

1. (canceled)
 2. (canceled)
 3. (canceled)
 4. A non-woven compositematerial comprising: a first unidirectional fiber reinforced layercomprising a first set of parallel fibers embedded in a W/B polymer,said first set of parallel fibers enclosed by a non-W/B adhesive; asecond unidirectional fiber reinforced layer comprising a second set ofparallel fibers embedded in a W/B polymer, said second set of parallelfibers enclosed by a non-W/B adhesive; and at least one W/B membranebonded to said first or second unidirectional fiber reinforced layers,said membrane comprising pores allowing transfer of gas or water vaporthrough said membrane, wherein said first and second unidirectionalfiber reinforced layers are oriented and bonded together such that saidfirst and second sets of parallel fibers are directionally offsetrelative to one another to create windows allowing transfer of gas orwater vapor through said unidirectional fiber reinforced layers; whereinsaid windows are absent said non-W/B adhesive; and wherein said windowsare at least as large as said pores.
 5. The non-woven composite materialof claim 4, wherein said first and second sets of parallel fibers aredirectionally offset at 90° relative to one another.
 6. The non-wovencomposite material of claim 4, further comprising at least one layer ofwoven or non-woven fabric.
 7. The non-woven composite material of claim4, comprising two W/B membrane layers, one bonded to said firstunidirectional fiber reinforced layer, the other bonded to said secondunidirectional fiber reinforced layer.
 8. The non-woven compositematerial of claim 5, further comprising a third unidirectional fiberreinforced layer comprising a third set of parallel fibers embedded in aW/B polymer, said third set of parallel fibers enclosed by a non-W/Badhesive, wherein spaces between said fibers are absent said non-W/Badhesive; and wherein said third unidirectional fiber reinforced layeris oriented and bonded to any one of said first and secondunidirectional fiber reinforced layers such that said third set ofparallel fibers is directionally offset relative to said first andsecond sets of parallel fibers, and said spaces align with said windows.9. The non-woven composite material of claim 8, wherein said third andfirst sets of parallel fibers are directionally offset at 45° relativeto one another.
 10. A sleeping bag shell, tent wall or clothingcomprising the non-woven composite of claim
 4. 11. The non-wovencomposite material of claim 4, wherein said fibers comprise extendedchain polyethylene.
 12. A non-woven composite material comprising: afirst unidirectional fiber reinforced layer comprising a first set ofparallel fibers embedded in a W/B polymer, said first set of parallelfibers enclosed by a non-W/B adhesive; a second unidirectional fiberreinforced layer comprising a second set of parallel fibers embedded ina W/B polymer, said second set of parallel fibers enclosed by a non-W/Badhesive; and at least one W/B membrane bonded to ether one of saidfirst or second unidirectional fiber reinforced layers, said membranecomprising pores allowing transfer of gas or water vapor through saidmembrane, wherein said first and second layers are oriented and bondedtogether such that said first and second sets of parallel fibers aredirectionally offset relative to one another to create windows allowingtransfer of gas or water vapor through said first and secondunidirectional fiber reinforced layers; wherein said windows are filledwith said W/B polymer, and wherein said windows are at least as large assaid pores.
 13. The non-woven composite material of claim 12, whereinsaid first and second sets of parallel fibers are directionally offsetat 90° relative to one another.
 14. The non-woven composite material ofclaim 12, further comprising at least one layer of woven or non-wovenfabric.
 15. The non-woven composite material of claim 12, comprising twoW/B membrane layers, one bonded to said first unidirectional fiberreinforced layer, the other bonded to said second unidirectional fiberreinforced layer.
 16. The non-woven composite material of claim 13further comprising a third unidirectional fiber reinforced layercomprising a third set of parallel fibers embedded in a W/B polymer,said third set of parallel fibers enclosed by a non-W/B adhesive,wherein spaces between said fibers are absent said non-W/B adhesive; andwherein said third unidirectional fiber reinforced layer is oriented andbonded to any one of said first and second unidirectional fiberreinforced layers such that said third set of parallel fibers isdirectionally offset relative to said first and second sets of parallelfibers, and said spaces align with said windows.
 17. The non-wovencomposite material of claim 16, wherein said third and first sets ofparallel fibers are directionally offset at 45° relative to one another.18. A sleeping bag shell, tent wall or clothing comprising the non-wovencomposite of claim
 12. 19. The non-woven composite material of claim 12,wherein said fibers comprise extended chain polyethylene.
 20. Anon-woven composite material comprising: a first unidirectional fiberreinforced layer comprising a first set of parallel fibers embedded in aW/B polymer; a second unidirectional fiber reinforced layer comprising asecond set of parallel fibers embedded in a W/B polymer; and at leastone W/B membrane bonded to ether one of said first or secondunidirectional fiber reinforced layers, said membrane comprising poresallowing transfer of gas or water vapor through said membrane, whereinsaid first and second layers are oriented and bonded together such thatsaid first and second sets of parallel fibers are directionally offset90° relative to one another to create grids of windows allowing transferof gas or water vapor through said first and second unidirectional fiberreinforced layers; wherein said windows are filled with said W/Bpolymer, and wherein said windows are at least as large as said pores.21. The non-woven composite material of claim 20, further comprising atleast one layer of woven or non-woven fabric.
 22. The non-wovencomposite material of claim 20, comprising two W/B membrane layers, onebonded to said first unidirectional fiber reinforced layer, the otherbonded to said second unidirectional fiber reinforced layer.
 23. Thenon-woven composite material of claim 20, further comprising a thirdunidirectional fiber reinforced layer comprising a third set of parallelfibers embedded in a W/B polymer, wherein spaces between said fibers areabsent said non-W/B adhesive; and wherein said third unidirectionalfiber reinforced layer is bonded to any one of said first and secondunidirectional fiber reinforced layers such that said third set ofparallel fibers is directionally offset 45° relative to said first setof parallel fibers, and said spaces align with said windows.